[Kurt P]

if the noise you refer to is static then that might be noise from switching power supplies in your house or LED lights.

Well, I went back and took another look and sure enough there was one piece of equipment that was creating most of the noise.  I must have missed it the first time, unplugging it knocked down the noise a LOT!  I can live with what's left.  Even though I knew to check for this, I guess I just needed a reminder...

Depending on how much you want to spend, either buy any curcular connector (Amphenol etc) rated at 400V or so, or use an old bad rectifier tube's base and the matching socket to make a plug.

This is the way I'm going to go, good suggestion and thank you!

Kurt.